Update README.md

nikitasavinov · web-flow · commit 22dab007ee47 · 2018-06-17T17:13:55.000+02:00
diff --git a/README.md b/README.md
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 # EntityFrameworkCore.Extensions
 
 Please check EntityFrameworkCore.Extensions.Samples for usage examples
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+# Build status
+[![Build status](https://ci.appveyor.com/api/projects/status/o1ljbar2tvkt5w7k?svg=true)](https://ci.appveyor.com/project/nikitasavinov/entityframeworkcore-extensions)
+
